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NASA-LLIS-1222
Lessons Learned - Understanding specific operational characteristics of selected design options (threaded Inserts)
Year: 1998
Abstract: Description of Driving Event:
Galling of threaded fasteners was experienced in the qualification test program of the Z1 Truss. Fasteners intended to be removable on-orbit galled during test. The fasteners were installed in locking threaded inserts ("KEEN" type).
Root cause: The inherent effect of the "Keen"-type, upset thread design is to bite hard into the fastener. After repeated installation and removal, the fastener will gall. These inserts work best engaged once, and are excellent in this application.
Galling of threaded fasteners was experienced in the qualification test program of the Z1 Truss. Fasteners intended to be removable on-orbit galled during test. The fasteners were installed in locking threaded inserts ("KEEN" type).
Root cause: The inherent effect of the "Keen"-type, upset thread design is to bite hard into the fastener. After repeated installation and removal, the fastener will gall. These inserts work best engaged once, and are excellent in this application.
Subject: Parts Materials & Processes
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:19:18Z | |
| date available | 2017-09-04T16:19:18Z | |
| date copyright | 09/30/1998 | |
| date issued | 1998 | |
| identifier other | THVEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/82765 | |
| description abstract | Description of Driving Event: Galling of threaded fasteners was experienced in the qualification test program of the Z1 Truss. Fasteners intended to be removable on-orbit galled during test. The fasteners were installed in locking threaded inserts ("KEEN" type). Root cause: The inherent effect of the "Keen"-type, upset thread design is to bite hard into the fastener. After repeated installation and removal, the fastener will gall. These inserts work best engaged once, and are excellent in this application. | |
| language | English | |
| title | NASA-LLIS-1222 | num |
| title | Lessons Learned - Understanding specific operational characteristics of selected design options (threaded Inserts) | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1998 | |
| contenttype | fulltext | |
| subject keywords | Parts Materials & Processes | |
| subject keywords | Procurement Small Business & Industrial Relations | |
| subject keywords | Risk Management/Assessment | |
| subject keywords | Test & Verification | |
| subject keywords | Test Article |